EP 0641541 A1 19950308 - Apparatus for obtaining images of cornea endothelium.
Title (en)
Apparatus for obtaining images of cornea endothelium.
Title (de)
Instrument zur Darstellung von Bildern des Endotheliums der Kornea.
Title (fr)
Appareil pour obtenir les images d'endothélium de la cornée.
Publication
Application
Priority
- JP 24198693 A 19930902
- JP 32965893 A 19931130
Abstract (en)
Provides an apparatus for obtaining images of cornea endothelium, which is capable of detecting an optimum imaging position by virtue of its ability of reliably detecting endothelium reflected light substantially weaker than epithelium reflected light when an eyeball surface is illuminated through a slit and the resulting cornea reflected light is used to obtain a focusing, in order that a magnified image of cornea endothelium cells of a subject eye is obtained. Also provides an apparatus for obtaining images of cornea cells, which is capable of not only detecting epithelium reflection with high accuracy but also measuring cornea thickness with simplicity and reliability. An endothelium-focusing detection use receiving optics 181 is set in such a position as to receive cornea reflected light of the slit light on an optical axis 141 that passes an objective lens 15 when an eyeball surface 2 is illuminated through a slit and an endothelium image of a subject part is formed in a focused state on an image receiving surface 22 of a TV camera 23 via a magnification-imaging optical system based on the illumination light. An epithelium-focusing detection use receiving optics 182 is set on an optical axis 142 branched from the optical axis 141 of the magnification-imaging optical system. For detection of the state how the slit light is received by the receiving optics 181, for example, a slit aperture 17 forward of the receiving optics or a detection-use slit aperture 7 in front of an illumination lamp 4 is used so that cornea endothelium reflected light can be detected with reliability. The receiving optics 181, 182 are provided by those optimum for their respective applications. In the case where cornea thickness is to be calculated, the cornea thickness is calculated in correspondence to an epithelium-reflected-light received position on the receiving optics 182 such as a line sensor at the time when endothelium reflected light has been detected by the receiving optics 181. <IMAGE>
IPC 1-7
IPC 8 full level
A61B 3/107 (2006.01); A61B 3/14 (2006.01); A61B 3/10 (2006.01)
CPC (source: EP US)
A61B 3/107 (2013.01 - EP US); A61B 3/145 (2013.01 - EP US); A61B 3/1005 (2013.01 - EP US)
Citation (search report)
- [XA] DE 4240583 A1 19930603 - TOPCON CORP [JP]
- [A] US 4019813 A 19770426 - CORNSWEET TOM N, et al
- [A] US 4705037 A 19871110 - PEYMAN GHOLAM A [US], et al
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0641541 A1 19950308; EP 0641541 B1 19990616; DE 69419089 D1 19990722; DE 69419089 T2 20000105; US 5471261 A 19951128
DOCDB simple family (application)
EP 94113392 A 19940826; DE 69419089 T 19940826; US 29603194 A 19940825